package com.gl.controller;


import com.gl.entity.UcenterMember;
import com.gl.service.UcenterMemberService;
import com.gl.utils.ConstantWxUtils;
import com.gl.utils.HttpClientUtils;
import com.gl.utils.JwtUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

@Controller
@RequestMapping("/api/ucenter/wx")
public class WxController {

    @Autowired
    private UcenterMemberService memberService;

    //微信登录，生成微信扫描二维码
    @GetMapping("login")
    public String login(){

        //跳转 根据固定地址拼接appid 重定向url state自设参数生成二维码
        // 微信开放平台授权baseUrl %s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirect_url = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try{
            redirect_url = URLEncoder.encode(redirect_url,"utf-8");
        }catch (Exception e){

        }

        //设置%s里面值
        String url = String.format(baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirect_url,
                "guli"
                );
        //重定向请求微信地址生成二维码
        return "redirect:"+url;

    }
    //扫描生成的二维码，会得到两个参数code，state
    //获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code,String state){
        try{
            //拿着code请求微信固定地址，得到两个值 access_token和openid 后面会用这两个值拼接一个地址请求获取用户信息
            //向认证服务器发送请求换取access_token
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接参数：id 秘钥 和code
            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);
            //请求这个拼接好的地址，得到返回两个值access_token和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值access_token openid
            //把accessTokenInfo转换成map集合，根据map里面key获取对应值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");

            //判断数据库表里面是否存在相同微信信息，根据openid判断，如果为空进行添加
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member == null){
                //拿着得到access_token和openid，再去请求微信提供固定的地址，获取到扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl,
                        access_token,
                        openid);
                //发送请求，获取扫码人信息
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //将扫描人信息的字符串转换为Map对象
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)userInfoMap.get("nickname");//昵称
                String headimgurl = (String)userInfoMap.get("headimgurl");//头像
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                //添加到数据库
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:8080/#/?token="+jwtToken;


        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }


}
